Appearing in "The Most Important Day of the Year"

Synopsis for "The Most Important Day of the Year"

On Valentine's Day, Harley Quinn escapes from Arkham Asylum with the intent of seeing the Joker. Harley Quinn enters the Joker's current base of operations, only to discover that the place has been raided by the Falcone Crime Family, who kidnapped the Joker. Harley Quinn finds Carmine Falcone, who is attempting to auction the Joker to a crowd of the Joker's former victims that want revenge. Harley Quinn breaks into the auction and interrogates Falcone on the Joker's current whereabouts. Falcone franticly tells her the Joker's location. Harley Quinn reaches said location, only to find Batman, who claims to have captured the Joker. Batman tells Harley that the Joker is at Arkham Asylum. Harley Quinn willingly turns herself in. At Arkham Asylum, Harley Quinn gleefully hallucinates that she is eating Valentine's Day dinner with the Joker. In all actuality, the hallucinations were merely the result of Batman drugging her.